%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Ruiz-Hernandez, J. C.
%A Condom, Thomas
%A Ribstein, P.
%A Le Moine, N.
%A Espinoza, J. C.
%A Junquas, Clémentine
%A Villacis, M.
%A Vera, A.
%A Munoz, T.
%A Maisincho, L.
%A Campozano, L.
%A Rabatel, A.
%A Sicart, Jean-Emmanuel
%T Spatial variability of diurnal to seasonal cycles of precipitation from a high-altitude equatorial Andean valley to the Amazon Basin
%D 2021
%L fdi:010083318
%G ENG
%J Journal of Hydrology : Regional Studies
%K Precipitation variability ; Diurnal and seasonal cycles ; Equatorial Andes
%K EQUATEUR ; ANDES
%K AMAZONE BASSIN ; GUAYLLABAMBA BASSIN ; NAPO BASSIN
%M ISI:000712249000002
%P 100924 [16 ]
%R 10.1016/j.ejrh.2021.100924
%U https://www.documentation.ird.fr/hor/fdi:010083318
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2021-12/010083318.pdf
%V 38
%W Horizon (IRD)
%X Study region: The upper part of the Guayllabamba and Napo basins (78.2 degrees W, 0.3 degrees S; 18,500 km(2)) in the equatorial Andes, which are vulnerable to stress on the ecosystem services. Study focus: This paper analyses the diurnal cycle of precipitation over a transect from the Andes to the Amazon. The diurnal cycle is estimated as the diurnal distribution of precipitation for 2014-2019 using records from 80 stations. Cluster analysis performed on the diurnal cycle estimates depicts the spatial association between the diurnal and seasonal cycles of precipitation. New hydrological insights: A northwest-southeast spatial variation in the diurnal and seasonal cycles is identified with four groups of stations. In the western part, the seasonal cycles of Groups 1 and 2 are bimodal with precipitation maxima in the March-April and October-November seasons and a short drier season in July-August. In the eastern part, Group 3 also presents bimodality, but a weaker seasonal cycle. Conversely, Group 4 is unimodal with a peak in June. Distinct diurnal cycles are observed in both drier and wetter seasons of Groups 1-3; no marked diurnal cycle is observed in Group 4. Groups 3 and 4 are the most spatially heterogeneous, with an exceptional horizontal variation of 330 mm/yr/km. The analysis of these variations provides insight into the atmospheric dynamics driving precipitation in this zone, and may help to better optimize the water supply system.
%$ 062